/**
 * Tests for cfc-frontend utils/bundle-pricing.js
 *
 * 验证购物车套餐offer展示辅助：comboOfferOf 命中/未激活语义；formatComboOfferText 提示文案；
 * 总价不再被自动扣减（纯展示，权威计算在后端 POST /api/cart/combo-offer）。
 */
const {
  comboOfferOf,
  formatComboOfferText
} = require('@/utils/bundle-pricing')

describe('comboOfferOf', () => {
  it('null/undefined → null', () => {
    expect(comboOfferOf(null)).toBeNull()
    expect(comboOfferOf(undefined)).toBeNull()
  })
  it('active 非 true → null', () => {
    expect(comboOfferOf({ active: false, comboName: '套餐X' })).toBeNull()
    expect(comboOfferOf({})).toBeNull()
  })
  it('active=true → 返回 offer（纯展示，不篡改总价）', () => {
    const offer = { active: true, comboName: '套餐X', comboPrice: 15000, saving: 2000, groups: 1 }
    expect(comboOfferOf(offer)).toBe(offer)
  })
})

describe('formatComboOfferText', () => {
  it('无 offer → 空串', () => {
    expect(formatComboOfferText(null)).toBe('')
    expect(formatComboOfferText({ active: false })).toBe('')
  })
  it('有 offer → 「这N件组成套餐「XX」，套餐价 ¥Y（省 ¥Z）」', () => {
    const txt = formatComboOfferText({ active: true, comboName: '豪华套餐', comboPrice: 15000, saving: 2000 }, 3)
    expect(txt).toContain('3 件')
    expect(txt).toContain('豪华套餐')
    expect(txt).toContain('150.00')
    expect(txt).toContain('20.00')
  })
  it('有 offer 无 checkedCount → 用 groups 兜底；saving=0 不显示省', () => {
    const txt = formatComboOfferText({ active: true, comboName: '豪华套餐', comboPrice: 15000, saving: 0, groups: 2 })
    expect(txt).toContain('2 件')
    expect(txt).not.toContain('省')
  })
})